Ediacaran fauna-first animals

Named for the Ediacara Hills of South Australia, in which they were discovered in 1946, were the first animals, despite sponges, made up of more than one type of cell, that required atmospheric oxygen for their growth. Almost all of these fossils are dated between 575 and 542 million years ago. These creatures had wide variety of shapes and sizes from circular discs reaching 20 cm to frond-shaped that can be as long as 1 meter. Some of them were similar to today's jellyfishes, soft corals and seeweed but some were unlike to the organisms known today. At the begining of the Cambrian explosion they disappear almost simultaneously probably becouse of the emergence of Cambrian predator animals. Ediacaran fauna's relationships with the rest of extant and extinct animals has not been possible to firmly establish, so they may not be connected to the rest of the organisms on Earth.



sources: 

https://www.google.com/search?q=ediakar&tbm=isch&hl=pl&bih=839&biw=1730&sa=X&ved=2ahUKEwjg_8emu7mBAxXSgSoKHRFOCKsQrNwCKAB6BQgBEMAB#imgrc=hfVqV5CGlRzrOM&imgdii=C88RUk_ApOLwvM
https://www.britannica.com/science/Ediacara-fauna
https://www.sciencedirect.com/science/article/abs/pii/B9780128143117000020

Komentarze

  1. englishdiary24 września 2023 21:58

    They look just like some plants in coral reefs in this reconstruction.
    Do you mean they cannot be placed anywhere in the chain of evolution: there are no organisms that evolved from them?

    OdpowiedzUsuń

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